List bookData = [
  {
    "title": "前端电子书",
    "time": "2020年4.8日",
    "imageUrl":
        "http://www.xiaozhoubg.com/public/uploads/IMG/BookImg/1577148360145.png"
  },
  {
    "title": "Java电子书",
    "time": "2020年4.8日",
    "imageUrl":
        "http://www.xiaozhoubg.com/public/uploads/IMG/BookImg/1577149152042.png"
  },
  {
    "title": "Php电子书",
    "time": "2020年4.8日",
    "imageUrl":
        "http://www.xiaozhoubg.com/public/uploads/IMG/BookImg/1577153557729.png"
  }
];
